Establishment of Straight Profile Hourglass Worm under Virtual Reality

Abstract

Virtual workpiece is widely used in dynamic simulation and can be imported into the Virtual Gear Measuring Center (VGMC) to be virtually measured. The tooth surface of hourglass worm is complicated, so the dynamic meshing performance is often improved by modification of the tooth surface. The design cycle of traditional tooth surface modification without digital virtual workpiece is long, and the dynamic meshing performance only can be judged by getting meshing spots with sample parts. In this paper, based on the direct digital modeling, the working tooth surface and the non-working tooth surface are processed respectively for the straight profile enveloping worm, and the errors introduced by the turning tool in the modeling process are eliminated. Segmental cutting and inversion methods are proposed to greatly improve the modeling efficiency. By writing software and parameterizing modeling process, the virtual workpiece model of the hourglass worm with controllable accuracy and no holes and redundant faces can be obtained conveniently and quickly. The model can improve the design efficiency and shorten the design cycle.